What are hashtags?
A hashtag is a combination of letters and numbers which starts with the symbol #. After a hashtag is published, you can click on the #hashtag to see other posts that are marked with the same hashtag.
You should keep in mind that posts from closed and private groups, as well as posts containing more than 10 hashtags, will not show up in a search.
Your search for returned no results.
Try using other keywords, e.g.: "delete profile", "create chat".
Check your request for misprints.